Why not.
Favorites
1. Pikachu
2. Sonic
3. Dark Pit
4. Toon Link
5. Rosalina & Luma
6. Falco
7. Greninja
8. Meta Knight
9. Pac-Man
10. Ike
Honorable mentions go to Mega Man, Palutena and Marth.
Least favorites (based on who I dislike using most)
1. Olimar
2. R.O.B.
3. Little Mac
4. Wii Fit Trainer
5. Yoshi
6. King Dedede
7. Donkey Kong
8. Jigglypuff
9. Mii Gunner
10. Samus
Favorite stages: Mario Circuit 8, Wuhu Island, Final Destination, Lylat Cruise, Battlefield, Delfino Plaza, Halberd.
Least favorite stages: Pac-Land, 75m, Palutena's Temple